Lock nut



July v5, 1932. i STROBER 1,866,067

LOCK NUT Filed June 17, 1930 LUDWIG TROBER mw TN-SGR:

M Cm

Patented July- 5, 1932l UNITED -sTATss PATENT OFFICE i LUDWIG s'rnonn, or 'MUNIcnf-:ennxm LocxNU'r application mea :une 17, 1930, serial No. 461,683, and-1n Germany Jury 4, 192e.

My invention relates to an improved nut lock and its principal `object is to provide a simple and efiicientconstruction capable of being economically produced..

5 Many forms of nut locks are known to the art and some of these forms 'are in actual use. A common form is one 'in which the usual nut is complemented by a locking nut, both nuts having serrated surfaces intended 1c to engage with each other or in some kcases the bolt is provided with a reduced threaded extension upon which the looking nut, threaded '.oppositely to the main nut 1s received. Another form is one in' which al cap or sleeve embraces the main' nut and the lockingnut" for the purpose of holding the same in locking position.

The principal disadvantage of these prior art constructions is that the locking member is designed to be held in place by threads and as threads are liable to strip or break down under load, the measure of security thus afforded is but slight. In an attempt to over come this disadvantage, a construction has beensuggested in which a lock nut or sleeve is mounted on an extension of the bolt so as' to be axially movable but held against rotation, the sleeve having an opening-corresponding in shape to and 'designed to receivel $9 the nut and a wedge being employed to prevent longitudinal movement of the parts. The defect of this construction is that, usually, the nut cannot be completely tight- `ened because its'position must always correspend to that of the locking nut orsleve and, obviously, if the nut cannotbe fully tightened the application of securing means will not produce the required measure of` safety. p

By means of my invention they defects of prior art constructions are obviated and, in accordance with my invention, l provide the nut and the lockingnut, which is axially movable but not rotatable on an extension .of the bolt, with interengageable serrations and I secure both nuts together by a common connecting member which embrace the two nuts.

In the preferred form of the invention the two nuts' areexteriorly threaded -and the connecting member is interiorly threaded for engagementwith the exterior threads of the nuts. As ai). additional precautionary measu re the connecting member may be held in place by a split ring.

Two forms of the invention are illustrated il' in the accompanying drawing in which Fig. 1,-is an assembled longitudinal sectional view of the preferred form; Fig. 2 is a side elevation thereof; Fig. 3 is a perspective view of a split ring used with the preferred form of the device; Fig. 4` is an elevational view of said ring; Fig. 5 is an assembled longitudinal sectional view of a modified form of the invention Fig. 6 is a side elevation thereof and Fig. pis a perspective view of the connecting members used with the form of Figs. 5 and 6.

In the formef invention shown in Figs. 1 to 4'of the drawing, `1 designatesthe bolt having an intermediate threaded portion and an angularextension 2 designed to receive a locking nut 3 having an orifice shaped to correspond Jto thel contour of the extension 2. -The forwardace of thellockingenut isserrated atafor engagement with similar serrations 5 on the forward face of the nut 6 threaded onto the bolt 1. The nut 6 hasan exteriorly threaded, reduced, extension 7 and n connecting or clampingfmember 8 which is interiorly left handedlytlireaded tc engage their exterior threads on the nuts 3 and 6.

frdjacentits outer end, the nut 3 is provided with an annularv groove 9 for the reception of a split ring 10 which serves-to secure the clamping member 8 in position. To facile itate insertion of the ring 10 in the groove 9 Y V-Iggfprovide adjacent the latter on the outer end the nuti3gaghelical path 11 which guides the ring intov position when the ring is turned. The ring is preferably hexagonal.

T he parts abovedescribed are assembled as Y follows z-The -nut 6 is tightly screwed onto the bolt 1, the locking nut 3 is placed on the bolt extension 2 and, if necessary,.the nut 6 is rotated to cause firm interengagement of the serrations 4 and 45. Thereupon, the clamping member 8 is screwed towards the left on to the exterior threads of the nut 3 and nut 6 until the flange 8 strikes and firmly engages the shoulder 3b whereby the nuts 3 and Gare tightly pressed together. Then the split ring 10 is placed in posltion in the groove 9 through the helical path 11 and all parts are interlocked. The clamping member 8 cannot become loose because it is secured by the ring 10 and the nut 6 is held against move- -ment by the nut 3, while the latter cannot rotate owing to the shape of the orifice therein and the extension 2 and also because of the interlock with the nut 6 and the grip of the clamping member. 4

In the modified form shown in Figs. 5 and 6, the nuts 6 and 3 are provided with enlarged x serrations 14`press against one another. To

accomplish this, the serrations 14 are steeply' pitched on one side and less so on the other;

The construction of the modified form is just as efficient as that of the preferred form but may be produced at less cost.

I claim Y 1.-,A lock nut construction, cclplslng a bolt, a shouldered nut thereon, a shouldered. lock nut on said bolt adapted to interlock with the first mentioned nut, and a flexible cono necting member having flanges for engagin the shoulders of said nuts and holdingthe latt'er tightly in engagement with eac/lnotherl'/ 2. A lock nut' consguctionfcomprising a bolt, a shglllderedfnut thereon having its forj,,w/Ward/face serrated, and having a peripheral shoulder, a lock -nut having a peripheral shoulder `and having `its forward face serrated for interlocking engagementfwith the 7 4 4serrated forward face of the firstmentioned/Y l nut, and a flexible/splitclamping member havingrlatera'l'flanges for engaging the shoulcderjs of said nuts and holding'the serrated faces thereof infirm interengagement.

Intest-imony whereof I affix my signature.

LUDWIGV STROBERa 

